from math import comb
from bisect import bisect_left
S = input().rstrip()
W = []
for i in range(len(S)):
    if S[i] == "w":
        W.append(i)
ans = 0
for i in range(len(S)):
    if S[i] == "c":
        w = len(W) - bisect_left(W, i)
        ans += comb(w, 2)
print(ans)